Question

我需要这样做：使用CardView的RecycleView。第一张卡是静态的：它显示＆＃34;此订单的详细信息＆＃34;。第一个之后的其他卡是动态的。所以我决定做这个代码：

public class DocumentTypeAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
{



private List<DocumentType> document; //lista di card da riempire
private Context context;


public DocumentTypeAdapter(List<DocumentType>document, Context context)
{
    this.document = document;
    this.context = context;
}


public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{

    View view;

    if(viewType == 0)
    {
        view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_info, parent, false);
        ViewSimple simpleView = new ViewSimple(view);
        return simpleView;
    }
    else
    {
        view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_info, parent, false);
        DocumentTypeViewHolder documentTypeViewHolder = new DocumentTypeViewHolder(view);
        return documentTypeViewHolder;
    }

}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
{

    DocumentType documents = document.get(position);

    if(getItemViewType(position)!=0) 
    {
        holder.title.setText(documents.getTitle());
        holder.cert.setText(documents.getTypeofCertificate());
        holder.lastmod.setText(documents.getLastModified());
    }

}

@Override
public int getItemCount()
{
    return document.size();
}

@Override
public int getItemViewType(int position)
{
    return document.size();
}

private class ViewSimple extends RecyclerView.ViewHolder
{
    public ViewSimple(View itemView)
    {
        super(itemView);
    }
}


public class DocumentTypeViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener
{
    TextView title, lastmod,cert;

    public DocumentTypeViewHolder(View itemView)
    {
        super(itemView);
        title = (TextView)itemView.findViewById(R.id.tipo);
        lastmod = (TextView)itemView.findViewById(R.id.ultimamodifica);
        cert = (TextView)itemView.findViewById(R.id.certificato);

        itemView.setOnClickListener(this);

    }

    @Override
    public void onClick(View v)
    {


    }
}
}

但它不起作用。我的问题是：

如何使第一张卡静态和其他动态？
我的数据在document列表中。那么如何对方法getItemViewType()说第一张卡是静态的，而其他卡是从列表document的大小生成的？

编辑：这是带有更改的代码：

public class DocumentTypeAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
{


private static final int STATIC_CARD = 0;
private static final int DYNAMIC_CARD = 1;
private List<DocumentType> document; 
private Context context;


public DocumentTypeAdapter(List<DocumentType>document, Context context)
{
    this.document = document;
    this.context = context;
}


public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
    View view;

    if(viewType == STATIC_CARD)
    {
        view = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_info, parent, false);
        ViewSimple simpleView = new ViewSimple(view);
        return simpleView;
    }
    else
    {
        view = LayoutInflater.from(parent.getContext()).inflate(R.layout.document_card_type, parent, false);
        DocumentTypeViewHolder documentTypeViewHolder = new DocumentTypeViewHolder(view);
        return documentTypeViewHolder;
    }

}

@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
{

    DocumentType documents = document.get(position);

    if(getItemViewType(position)==DYNAMIC_CARD)
    {
        DocumentTypeViewHolder mHolder = (DocumentTypeViewHolder)holder;
        mHolder.data.setText(documents.getData());
        mHolder.status.setText(documents.getStatus());

        Picasso.with(context).load(documents.getImage().toString()).into(mHolder.image, new com.squareup.picasso.Callback() {
            @Override
            public void onSuccess() {

                Log.d("Picasso","success");
            }

            @Override
            public void onError()
            {

                Log.d("Picasso","error");

            }
        });

    }

}

@Override
public int getItemCount()
{
    return document.size();
}

@Override
public int getItemViewType(int position)
{
   if(position == 0)
    return STATIC_CARD;

   else
    return DYNAMIC_CARD;


}

private class ViewSimple extends RecyclerView.ViewHolder
{
    public ViewSimple(View itemView)
    {
        super(itemView);
    }
}


public class DocumentTypeViewHolder extends RecyclerView.ViewHolder
{
    TextView data, status;
    ImageView image;

    public DocumentTypeViewHolder(View itemView)
    {
        super(itemView);

         data = (TextView)itemView.findViewById(R.id.dateCharging);
         status =(TextView)itemView.findViewById(R.id.statusCharging);
         image = (ImageView)itemView.findViewById(R.id.documentImage);

    }


}
}

感谢您的回答

Answer 1

你应该覆盖getItemViewType()，并在它应该是动态卡或静态卡时返回不同的值。由于您希望第一张卡是静态的，因此当位置== 0时，您应该返回不同的值。这将看起来像这样：

    private static final int STATIC_CARD = 0;
    private static final int DYNAMIC_CARD = 1;

    @Override
    public int getItemViewType(int position) {
        if(position == 0) {
            return STATIC_CARD;
        } else {
            return DYNAMIC_CARD;
        }
    }

然后在您的onCreateViewHolder()方法中，您应该检查viewType，并根据结果，您应该膨胀View，您已经做好了，但我会替换硬编码的0使用private static final int STATIC_CARD。

修改：我想到，如果您只需要一张静态卡，您可以考虑在CardView / {{1}中添加Fragment } xml布局并将其余动态卡放在该静态卡下面的Activity。

Answer 2

我建议你使用一个已经正确实现/处理所有这些内容的库：https://github.com/eyeem/RecyclerViewTools

完全披露：我写了这个库

只需为动态项目编写适配器，然后：

DocumentTypeAdapter adapter = new // your adapter here
WrapAdapter wrapAdapter = new WrapAdapter(adapter); // that's from the library
wrapAdapter.addHeader( /* add here your static view */ );
recyclerView.setAdapter(wrapAdapter);

并将其添加到build.gradle

repositories {
    maven {
        url 'https://oss.sonatype.org/content/repositories/snapshots/'
    }
}

dependencies {
    compile 'com.eyeem.recyclerviewtools:library:0.0.3-SNAPSHOT@aar'
}

RecyclerView带有一张静态卡和其他动态卡

2 个答案: